I have a 2001 mustang gt. I recently got done with my complete build to a 5.0 stroker with forged crank, h beams and pistons. My bottom end should be plenty solid now and i am going to be dialing in a bigger shot. I have upgraded 255 lph fuel pump. I was wondering what the biggest shot i can run on that motor will be..and also will the stock injectors be big enough to hold up to a bigger shot. I want to run 150 and then work up to no more then 225. I also have a tune and will get a tune every time i move to bigger shot. Maybe some comments on what i need to get to feed this kind of juice...thanks

 

You will fine with the 150 shot without any problems. Sounds like the bottom end is now bulletproof, as you start going up the size of the shot you may want to look into stages of nitrous or a progressive nitrous controller, instead of hitting the motor in the head with a 200 or 250 shot. Your tuner should be able to tell you what size injector and other other changes your motor needs to run safe.

Be careful and dont go too crazy with the juice. Hang on tight!

 

over 150 you should really move to a custom direct port kit and a different intake. Your stock intake is plastic and poorly designed for use with large wet shots of juice.

You should probably look at the shot size as being a dictating factor in the parts list. Either a custom direct port kit with most any aluminum manifold or a plate setup with a single plane intake is the ticket to larger shots. I'm figuring close to 475 to the tires on a 200 shot which will start to tax your existing fuel pump. No sense not having enough fuel.

I'd consider looking at an edelbrock intake and a 4150 plate setup for the nitrous injection:

You'll need:
MMR part # 220117 (Edelbrock adapter for GT plenum)

Edelbrock intake manfold
http://www.summitracing.com/parts/EDL-2838/
4150 Plate kit
http://www.summitracing.com/search/P.../?Ns=Price|Asc

You should also really really think about a progressive controller. 200hp 250tq extra to the tires instantly can easily blow traction and put you in the wall.

 

Sorry i didnt put all info in first post. I am using the NX express plate system that is pretty similar to the links that you sent me, from what i gather. The nitrous is tapped into the top of the fuel rails-minus the shrader valve so it has 40-50 lbs from my fuell pressure gauge. Do you think that i need more than that. And also has anyone see numbers from what a 5.0 stroker with 200 or even 225 will do. thanks

 

I was gonna say over a 150hit you can't use a fogger nozzle. However the NX plate kit has been used for up to 225hp shots on the stock manifold. Hell there was a few guys hitting 2v's with 200shots on the stock bottom end it was pretty sweet. I don't know what 255lph pump you have but I hope its for a returnless fuel system and not the old style walbro ones or the like. With upgraded pump like a Ford GT pump and maybe a boost a pump to be super safe you can hit it with a 200shot pretty easily with a tune. Also injector size doesn't matter because your kit is adding the fuel not the injectors.

 

really, people are seriously putting 225 through a stock 4.6 manifold? That's just dumb to me. It's just asking for any damage to get big fast.

In any case, you need enough fuel pump for ~550whp. My thinking: You've got probably 300rw or thereabouts now, add 225 from the kit and you're at over 500 pretty much no matter how you slice it. In all circumstances you need to supply enough fuel to feed the hp you make. After you cross around 450 things get complicated. I'd have to change my recommendation to a dual pump setup (03 cobra or Fore) and a dual FPDM kit, and ditch my standalone fuel suggestion. Tapping that much from the schrader valve.. me not thinky good idea. I'd tap it from the fuel line before the rails.